diff options
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/proc.c | 4 | ||||
| -rw-r--r-- | net/ipv4/tcp_cubic.c | 31 |
2 files changed, 26 insertions, 9 deletions
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 6513ade8d6dc..8f9cd200ce20 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -288,6 +288,10 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TCPWantZeroWindowAdv", LINUX_MIB_TCPWANTZEROWINDOWADV), SNMP_MIB_ITEM("TCPSynRetrans", LINUX_MIB_TCPSYNRETRANS), SNMP_MIB_ITEM("TCPOrigDataSent", LINUX_MIB_TCPORIGDATASENT), + SNMP_MIB_ITEM("TCPHystartTrainDetect", LINUX_MIB_TCPHYSTARTTRAINDETECT), + SNMP_MIB_ITEM("TCPHystartTrainCwnd", LINUX_MIB_TCPHYSTARTTRAINCWND), + SNMP_MIB_ITEM("TCPHystartDelayDetect", LINUX_MIB_TCPHYSTARTDELAYDETECT), + SNMP_MIB_ITEM("TCPHystartDelayCwnd", LINUX_MIB_TCPHYSTARTDELAYCWND), SNMP_MIB_SENTINEL }; diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c index 20de0118c98e..c1d07c7ed03d 100644 --- a/net/ipv4/tcp_cubic.c +++ b/net/ipv4/tcp_cubic.c @@ -363,16 +363,28 @@ static void hystart_update(struct sock *sk, u32 delay) struct tcp_sock *tp = tcp_sk(sk); struct bictcp *ca = inet_csk_ca(sk); - if (!(ca->found & hystart_detect)) { + if (ca->found & hystart_detect) + return; + + if (hystart_detect & HYSTART_ACK_TRAIN) { u32 now = bictcp_clock(); /* first detection parameter - ack-train detection */ if ((s32)(now - ca->last_ack) <= hystart_ack_delta) { ca->last_ack = now; - if ((s32)(now - ca->round_start) > ca->delay_min >> 4) + if ((s32)(now - ca->round_start) > ca->delay_min >> 4) { ca->found |= HYSTART_ACK_TRAIN; + NET_INC_STATS_BH(sock_net(sk), + LINUX_MIB_TCPHYSTARTTRAINDETECT); + NET_ADD_STATS_BH(sock_net(sk), + LINUX_MIB_TCPHYSTARTTRAINCWND, + tp->snd_cwnd); + tp->snd_ssthresh = tp->snd_cwnd; + } } + } + if (hystart_detect & HYSTART_DELAY) { /* obtain the minimum delay of more than sampling packets */ if (ca->sample_cnt < HYSTART_MIN_SAMPLES) { if (ca->curr_rtt == 0 || ca->curr_rtt > delay) @@ -381,15 +393,16 @@ static void hystart_update(struct sock *sk, u32 delay) ca->sample_cnt++; } else { if (ca->curr_rtt > ca->delay_min + - HYSTART_DELAY_THRESH(ca->delay_min>>4)) + HYSTART_DELAY_THRESH(ca->delay_min>>4)) { ca->found |= HYSTART_DELAY; + NET_INC_STATS_BH(sock_net(sk), + LINUX_MIB_TCPHYSTARTDELAYDETECT); + NET_ADD_STATS_BH(sock_net(sk), + LINUX_MIB_TCPHYSTARTDELAYCWND, + tp->snd_cwnd); + tp->snd_ssthresh = tp->snd_cwnd; + } } - /* - * Either one of two conditions are met, - * we exit from slow start immediately. - */ - if (ca->found & hystart_detect) - tp->snd_ssthresh = tp->snd_cwnd; } } |